Earlier in the snapshots, I'm aware there was a bug where sounds were "too directional" but was later "fixed." I'm still having what I think is that issue. Sounds are generally, very strange in 1.13 and different from previous release versions (1.12.2 etc.) When turning a different direction from where a sound is coming from, the sound becomes strangely muffled. I am not the only one who has this problem on the release of 1.13 as I searched other forums and have found people with similar problems. I know some people are afraid of clicking links but I did find two videos of what it sounds like: 

https://www.youtube.com/watch?time_continue=15&v=SiiU0E4tIzg

https://www.youtube.com/watch?time_continue=25&v=plJH_p2ifE8